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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cd8bb57aa64c4abda5aae7b026ca1de2382a81ddff5d0407a25ef611d32bee' 
  AND token = 'V5uuh9uZVJM8q6VhZcVkzlrFjPaITxV4O+SR8SQSrCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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