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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dde57aaf74d260fa81fb9f2ac3f11982e38f75eca35595c6879e919b3627b85' 
  AND token = 'CFD38PsD0lqw4WhhbLPu9+me54Gi9ug56euuldvZ3S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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