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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435698b2e049656521bb7d241cc0d841c6f1fc2bee691e1cd830928bf1996bd5' 
  AND token = 'hDNFFVEBbmBK9iCfR0Y2GRvJ9QqpjYt2HMiL2iEEs3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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