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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc746fe40ca0d02d06ee573710ca2a8c4526c74faae0231ae71e2b0d3d0dc6d8' 
  AND token = 'Y9HIp1GOZaJ32ZgLSkCEzxoySqQ2jeBHh2EWY0ay9O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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