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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f7332a454c6a082c3b92c2564c65f596fde6cea30561bfa46371c87b69027f' 
  AND token = 'ebK2rNIBkADxgOFjl3WGhGXSlfvcjg8bRRrh7fyrI48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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