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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb984e89d69a3ee1e772a1e5a3cb858ca33ebf86c5a7ff80eab7fe8fd054f45' 
  AND token = 'EFL3mjI87ix2syyi+FVv5gY5B4I6ZAUBWfhGJrw99IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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