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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8432c2c3d66612349c62e63173b7ee0b2ae894eca1bf32c06232b2d9c2543374' 
  AND token = 'rZeGyARZjhS7vlKl7cZ1DqSwndBDbuCMpYOlNbe2zcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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