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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ed667b2d22588f43582fc2a9a1ff5ed70ded59d5f3785fbe78f9889f56bbe8' 
  AND token = 'aFXolSrHbHA3auvtj/V065pG60q1Xii3dcWg0c+l5TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}