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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c95b1f4fb5565525ca11847446d6d2b82815236f4c388a14659a3d53436ac0' 
  AND token = '15ktPD516zHsUhu2eD0LZlGqv8WMM3xXg5dd/dPKR2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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