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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09def55769787e70d301d201cd929a17a7d145d9c3368c4862a5c2fb1e086266' 
  AND token = 'qbgq0N8CHsY3uK3M3zUurJfHu/sdOJ8TDlyYR/3WZQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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