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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f4208e9c5eaeac911bac342c1eb55089b86ceffb226579b7a42c295dc139f1' 
  AND token = 'Zd/rAdhq7Tc9sZ6twzzJeYfpnaqSJ8siBbhtIe7cbIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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