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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cce1907c24258d0739455b82a2f74a82317f9ecd68fd7714f3d621963440ad' 
  AND token = 'QVvYM1aN9pIPpmsAu8+aEWcx1MP6pleU5JBR4nLtv/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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