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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b9bda95b64cd83e23baeadbc8bf7fa2e82bd696a3e31c450ea5418e38df473' 
  AND token = 'W9pgBaJIPVW8+s3f3NTl0T5YYOjV1YPwRxt8RxU+1uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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