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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6547fe48f5ad873785084bc1f7b86f702cc8a91d630036a1a1aebe4eb636ab6a' 
  AND token = 'S6ewDtKXXLab7BnHfKbDLw30yafRNoGFqQLxA+jFAxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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