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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eba4b76f9a943257955e5937cbc81b899cd22159429c58cc1920674aba18d4a' 
  AND token = 'YMqKUKM3r9W72Cz4VQotHAnA7otlKmhwXclbpimP464=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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