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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89712247ab07c5f121217dc3dc998275f63612335e3e0e566589f3af7733bf7e' 
  AND token = 'vQv3YuEdd73ktjAHEyAkh4IAMCKZgM968bqYF6S3V1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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