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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8814f42117d654ea6597b672e9d92dbcbdf9e75e0aa2528c1d06f55e9a629c58' 
  AND token = 'q2EQ/6eUmpS9Aca0NQPkjhjfMNPtUjDi3fsc27fM2Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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