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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad5f331b6d52291802535008728430f92a918e3e1df28e1fa71be5f17f47d7a' 
  AND token = 'sXiOhnq62lUNgF49KRDnFf4FtCg1dks8XVarCQ5wTvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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