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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9ab64c9ed26315d5f488495eed2d2fbc8f07a8524de843e6804e23a8fa9cb3' 
  AND token = 'YcuJw8kgLLbwr2MtR+pjorAAFIZIx4mEWJ6jcnHrE3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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