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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df261e070f84ed708b690d667b232477a8f1d41987bf757667e0ef7864263288' 
  AND token = 'AJDsjnX5p+9W/dd/E49mWArKvr9ntNgSHMyMinHOKLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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