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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619c206f8a19268246d4311e89194b2ca0326d71b87e050800dc1799f7ca82a9' 
  AND token = 'd2sYQQhBrfFbO0tRS6mwrwbr+zcuVEcZ8YcQ5ozsr5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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