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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c60f56ab7be782091da62b73d2e773aec87b6818a3a1e5c4cdb492b756155e' 
  AND token = 'bJR3AROfmx9MRlfJsXT+B/y4agyuQUhe5znaG1B6/6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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