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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72b95b4ca610b301125e19be01922ae6c7d1c65a73a8ca4eb73cc1be3b0ff9a' 
  AND token = '2rIWf0RRjXn9hho/gv8DvgBE/XShwVnHtDZ8Gtb1Zm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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