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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c7be3ab22b95155abde1f59f71dc8083f04c4dc8c4ce3c61f59c840431bfa3' 
  AND token = 'VvgZhdkIZkO0VVAXOM2k5QLsg17DefCK8V0oYySUhNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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