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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae215a9ba58c3537aa7fd3446233fb3eeea66ed8f91d7155029ae82ec239ee89' 
  AND token = 'AmejC1WHmtOWVojNxTZDVu5ZJjsfMdKC9b7rFo15++I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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