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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cca2ae87737a8d5bbdbb80c035ec3c7cd345b595dda60c63c5c18361f7ebc76' 
  AND token = '6UVV5pkc3X6gXT0Z+EIFCdFaUdxM9Dh0c9GUednz6rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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