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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b47c1818345af77552cddc880b138ac90946fe679945df6c9e8464f5bff281' 
  AND token = '02l1PCh0ulhV5P7CbopUQ/I8vKDEj/j8eNeVEIeUFoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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