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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fc4d97d6ac9ef1480d44aad2a2fca35daaaa9d9f8af0bcb0d49108ad197ed5' 
  AND token = 'ALy4WDAgQQ2BkIIoUc/kf6Isv0YQY9AnFoCFZmpppC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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