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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101c3c89523ae66af735ed6dd9afa0fe9e7b07ed66bf801ec2a1aaa0c04e642a' 
  AND token = 'LQ7QDaHn2eJkdFyDB175yfMNb7JSP8EWH9bfN5xhwTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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