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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d2150c7dcb591e97a9b94ebbb75e8ba26766a40506e1fe1b2068023bf3663a' 
  AND token = 'yWDPrx3/5Ep9Zo3MfWuNvrCIF/2uhIH3w28q1F66yns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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