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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bf1affee759915bdee20d98a5bd654e7d86db45c3a5057465df0ab1b7aff21' 
  AND token = 'ZXfQCYJifeDUTWM5niDvjxsR3ifxoVTFy+qm6Dn0yQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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