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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eca17b1b004eee9e3da0905eb7f8075db1f715c8ef053c66780b805770ec2e4' 
  AND token = 'xsZ8HAXU5VxA53pMdik0qcLkPctX91GB4aacGeWmOZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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