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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9f73a4e7d6c03da51c61988c108e9ef72cf2283cd7ddcfe3d6f4b8767b472f' 
  AND token = 'ZjUopeRNk/NUbAjV4eOTduQ9dTXxLj24VF8xQhAMpyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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