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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d150e57424f1940a0ce7d31c2683b0f6a3444c91400fb4642bb75abba5a1b4' 
  AND token = 'Mq0XfLyw1LcJiR08r9cajKWnMXR7rHqehqB9uPTDkSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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