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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ba9e5fe4168d74081cae76f5203ebec00154d4dc1fb3deffd5ee1e18e26b1e' 
  AND token = 'pFJ4R8cNH/MGI1cnQFGa/osRUzHoyfovrKv7BlcTg14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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