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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed9f368e60c32a4ab629090dcf4624a84f8827e52859507365c2396eb36067f' 
  AND token = 'B3rbRpIwT1NcLta9DWelGFiHHB8Kwosu6rQAAyCJuag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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