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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b972379c2a9d66f785988a3c0a3661d8fcca702d80ffe529c107d47796d95d7' 
  AND token = 'S3gm5JFsSpgLS18i766zs5kxtI3fLLpjdTrnnvlRrFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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