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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489bac108fe6a0673bf582c25b6911d01e5d524cb9c3ca0724fd0eddd82c4240' 
  AND token = 'Q0sdgeWm6QPaFzb6crA3mXOCqwc59rr04gsvZvwG19k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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