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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0607ef78a3367575109da135521b60e76ea72752b324bf2c044556d3f8bb8757' 
  AND token = 'UKaPBua/dn/iYW7oINtGYj27+1MD030BU/l9W1mUjEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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