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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb03e7a6204ff300f6a635dbdc272236606fa7f9188ed2f49273d8cbea154602' 
  AND token = '/P1XrtEr+l0npBfeMIyX6KrI8ZC0Is9VcgCINjpaAjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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