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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194ee0538cecff2fe6d377368c91d9b177963cc3b6c36dd1aae4d702d4b3b237' 
  AND token = '2TwrRsSplWwKtr8MAHW2MhLh/QKbJ0fSYihh8J0ISKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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