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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2831d1c2639282df3c25d1488ef5cc1a322764fb7e27f1c1672993420dc211b9' 
  AND token = 'qhME0548Nx/08tbfeYXYF8DSXwTg5B5QuPpaD5qZqcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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