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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf11897a40272acaeb60eb859116478c1d9e2727187e5bd4324303526f3ac7f' 
  AND token = 'YgfYIVgbCGrKAag59S2NwGMnr3zQhkRCF/3atxzVs18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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