SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1d019669d09f9b6f0528de4c345d59a8151b4d22fc7ebbe167683d3bb8033b' 
  AND token = 'BWzEKO7cATiFmJ6IfVrOSqRvf8r/p+vdwBmMOygLtYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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