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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e6df7b400a5f343a2615417cc14dd3ccd12f7264c21125af406d09592f3868' 
  AND token = '6cW2YiBLxH5161KYrXIK9IOc/JjcVQa7cEjIXdiM40E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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