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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c84e909f17dd8d3c1148476a4e79fd1f52255aba881896c5758ea4a025adcb' 
  AND token = 'MY3hzKcyiQXPnTNqnL7R33Ar9EWqzQopOW/lW/Ib3Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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