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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95740fe40384f90d2a34a373a73d8e5d4bb6d08d2d3a3d8e9573281a93c6ff64' 
  AND token = 'Z8IE4866Fk54fCkhVxzfl1WqDClFzwRTUlW7L2uFifY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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