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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9b303478b7e9eeeb24394dfef236329da6c7a8dd65c7fa8818f73263542e8d' 
  AND token = '7ZmW94oAUaTXrTTqdl8B39Ob6fDNFDHbrT9lTHP+vbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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