Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c3aed81b78a2caea367e9667884e2d5cf88a256058da79ca05f3b47edbe273' 
  AND token = 'fM8m9AYiolnLd48c1eYMlFCNguxofyvcWLrbd0H9M5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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