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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5ebd0167225b1fbf1c0ece3569af10d2ffa237ff787e481f41db06ad375475' 
  AND token = 'Oawci7TQatIDl5aFCCbq/9bGV8DgFYxh2m/CADwcQt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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