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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12c11a83d4c8bd695a56a71bdcdf2e36291333c58f5eaf829caecdf42cf5857' 
  AND token = 'bI+UtByBp0h+1/Q3GnufEAtAJeiwQnZYt+EpcMm/nfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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