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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c524b4dc61223e81991b370ffcb2b9bcb2324a8eb0a49726ec402d853ccb6b1' 
  AND token = 'gShRcRF4cI9EEOkspEW1xs5eWWpoz5yFpOkZVbvNJ58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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