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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f345ff6b365296a4133833ae4ca2829f15f2b54b48a9ffdb41a025845e1a13' 
  AND token = 'SWt3CWuNfECwdJtZGjL/9IdX7knSYP/6vC56jxiuIcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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